Patient: Description of the condition (onset time, main symptoms, hospital, etc.): There is a hole in the tooth, and chewing food with a little pain, so I went to the hospital, the doctor said the tooth decay is deeper, to kill the nerve, I heard a shock, and did not react more, she helped me put in the tooth to kill the nerve medicine, I came back to check, the tooth extracted the nerve is to become brittle, then become dead pulp teeth, I think the doctor irresponsible. I think the doctor is irresponsible. If the nerve was not exposed, however, the doctor did not take conservative treatment, has helped me to put inactivation drugs in the tooth, a week, I have to go to the nerve extraction this week. Is the nerve extraction the only way to go? Can’t I save this tooth? Is she doing the right thing? Does every doctor treat it differently? Thank you. Can I save a nerve that has been deactivated? The dead pulp tooth has no feeling and cannot absorb nutrients, is it very serious? Duan Jin, Department of Stomatology, Huzhou Central Hospital: The nerve of the deactivated tooth is dead and must be extracted. And it must be reviewed on time to remove the deactivator. Dead pulp teeth cannot absorb nutrients from the pulp, but there are still nutrients from the periodontium. The dead pulp tooth only has no sensation of hot or cold, but it can distinguish the amount of biting force. The tooth will become brittle, and if the defect is large, it can be protected with braces (e.g., porcelain) after root canal treatment. If the tooth decay is deeper, sometimes although the nerve is not exposed, but it is very close to the nerve, the nerve may have been infected, this is generally need to extract the nerve.